espèce (1) comportement (1) besoin (1) aliment (1) taux (1) Food (1) Communication (1) Will (1) Species (1) Proportion (1) Parents (1) Negotiation (1) Food (1) Competition (1) Communication (1) Brothers and sisters (1) Begging (1) Barn owl (1) Animal clutches (1) Will (1) Influence (1)